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description("Series of tests to ensure correct results of the winding rule.");
var tmpimg = document.createElement('canvas');
tmpimg.width = 200;
tmpimg.height = 200;
ctx = tmpimg.getContext('2d');
// Create the image for blending test with images.
var img = document.createElement('canvas');
img.width = 100;
img.height = 100;
var imgCtx = img.getContext('2d');
function pixelDataAtPoint()
{
return ctx.getImageData(50, 50, 1, 1).data;
}
function checkResult(expectedColors, sigma) {
for (var i = 0; i < 4; i++)
shouldBeCloseTo("pixelDataAtPoint()[" + i + "]", expectedColors[i], sigma);
}
// Execute test.
function prepareTestScenario() {
debug('Testing default clip');
ctx.fillStyle = 'rgb(255,0,0)';
ctx.fillRect(0, 0, 100, 100);
ctx.fillStyle = 'rgb(0,255,0)';
ctx.beginPath();
ctx.rect(0, 0, 100, 100);
ctx.rect(25, 25, 50, 50);
ctx.clip();
ctx.beginPath();
ctx.fillRect(0, 0, 100, 100);
checkResult([0, 255, 0, 255], 5);
debug('');
debug('Testing nonzero clip');
ctx.fillStyle = 'rgb(255,0,0)';
ctx.fillRect(0, 0, 100, 100);
ctx.fillStyle = 'rgb(0,255,0)';
ctx.beginPath();
ctx.rect(0, 0, 100, 100);
ctx.rect(25, 25, 50, 50);
ctx.clip('nonzero');
ctx.beginPath();
ctx.fillRect(0, 0, 100, 100);
checkResult([0, 255, 0, 255], 5);
debug('');
debug('Testing evenodd clip');
ctx.fillStyle = 'rgb(255,0,0)';
ctx.fillRect(0, 0, 100, 100);
ctx.fillStyle = 'rgb(0,255,0)';
ctx.beginPath();
ctx.rect(0, 0, 100, 100);
ctx.rect(25, 25, 50, 50);
ctx.clip('evenodd');
ctx.beginPath();
ctx.fillRect(0, 0, 100, 100);
checkResult([255, 0, 0, 255], 5);
debug('');
}
// Run test and allow variation of results.
prepareTestScenario();
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